The logistic regression parameters in Equation REF  cannot be derived using conventional methods such as maximum-likelihood estimation, due to unavailable IPD for the competitor trial. Signorovitch et al. propose using a method of moments instead [1]}. This attains exact covariate balance across studies by centering the IPD covariates on the moments published for the competitor trial. Weight estimation involves minimizing the objective function:
\(Q(\mathbf {\alpha _1}) = \sum _{i=1}^{n} \exp \left( z_i \alpha _1\right).\) 
